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		<a class="header-logo header-affix-hide margin-left-no margin-right-no" data-offset-top="213" data-spy="affix">[Usaco2005 dec]Barn Expansion 牛棚扩张</a>
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                [Usaco2005 dec]Barn Expansion 牛棚扩张                </h1>
                <p>时间限制：5s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：64MB</p>			</div>
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                                <h3>题目描述</h3><p><p><span style="font-size: medium">Farmer John has N (1 &lt;= N &lt;= 25,000) rectangular barns on his farm, all with sides parallel to the X and Y axes and integer corner coordinates in the range 0..1,000,000. These barns do not overlap although they may share corners and/or sides with other barns. Since he has extra cows to milk this year, FJ would like to expand some of his barns. A barn has room to expand if it does not share a corner or a wall with any other barn. That is, FJ can expand a barn if all four of its walls can be pushed outward by at least some amount without bumping into another barn. If two barns meet at a corner, neither barn can expand. Please determine how many barns have room to expand. </span></p>
<div><span style="font-size: medium">&nbsp;&nbsp;&nbsp;&nbsp;约翰有N(1&le;N&le;25000)个矩形牛棚，它们的墙均与坐标轴平行，而且其坐标在[o，1061范围内．任意两个牛棚不重叠，但可能会有公共的墙．&nbsp;由于约翰的奶牛持续增加，他不得不考虑扩张牛棚．一个牛棚可以扩张，当且仅当它的四边均不与其它牛棚接触．如果两个牛棚有一个公共角，那它们均是不可扩张的．统计有多少牛棚可以扩张．</span></div></p><hr/><h3>输入格式</h3><p><p>* Line 1: A single integer, N</p>
<p>* Lines 2..N+1: Four space-separated integers A, B, C, and D, describing one barn. The lower-left corner of the barn is at (A,B) and the upper right corner is at (C,D).</p>
<p></p>
<div><span style="font-size: medium">&nbsp;&nbsp;&nbsp;&nbsp;第1行输入N，之后N行每行输入一个牛棚的左下角和右上角坐标．</span></div>
<div><span style="font-size: medium">输出说明</span></div>
<div><span style="font-size: medium">&nbsp;&nbsp;&nbsp;</span></div></p><hr/><h3>输出格式</h3><p><p>* Line 1: A single integer that is the number of barns that can be expanded.</p>
<p><font size="4">&nbsp;输出可扩张的牛棚数．</font></p></p><hr/><h3>样例输入</h3><pre>5
0 2 2 7
3 5 5 8
4 2 6 4
6 1 8 6
0 0 8 1

INPUT DETAILS:

There are 5 barns.  The first barn has its lower-left corner at (0,2) and
its upper-right corner at (2,7), and so on.
</pre><hr/><h3>样例输出</h3><pre>2

仅有前两个牛棚可以扩张．</pre><hr/><h3>提示</h3><p>没有写明提示</p><hr/><h3>题目来源</h3><p>Gold</p>
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